Ion3 port is obsolete

The Ion3 port at [1] is obsolete and should be upgraded, or at
least users be made very sure that they don't come asking me for
help. It is also misnamed: there's no such things as "Ion 20070318".
It's Ion3, __development snapshot__ 20070318. Read that emphasised
portion again, and think for a moment. Users should be made _highly_
aware of that fact, especially when distributing such antiquated
releases.

  [1]: http://www.openbsd.org/4.2_packages/i386/ion-20070318p1.tgz-long.html

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Tuomo